Coma has more than one meaning:

• In medicine, a coma refers to a particular state of unconsciousness.
• In astronomy, a coma is part of the tail of a comet, produced by vapor boiled off the comet as it nears the sun. It is named for "hair".
• In astronomy, sometimes "Coma" is shorthand for the constellation Coma Berenices.
• In optics, a coma is an optical aberration in an astronomical telescope which causes a V-shaped flare to the image of a star. About coma in an Newtonian telescope.
• In computer science, COMA is the abbreviation of Cache Only Memory Architecture.

• Coma is a 1977 novel by Robin Cook.
• Coma is a 1978 film based upon the previous book starring Geneviève Bujold and Michael Douglas.
• "Coma" is a song by Guns N' Roses, appearing on the album Use Your Illusion I.
• Coma is a Polish band.
• COMA (Community Of Moral Advancement) is the original name of the Finnish demo group Kooma.

Koma | Coma | Coma | Кома | Koma